If you have more than one data set, you may set up your login to access them both or you may set up a different login for each. Once you have the Logos Profile created, you may choose the data sets to which that Profile has access through the Data Sets button.
Go into System & Users, Users, Maintain Users.
Click on the List tab and find your login. Double click on your Login. Then, click the Data Sets button and select the Data Sets you would like to access through the select Logos Profile. Click OK, then Save (top).
Now, when you log in, you will have access to the selected data sets. Enter your Username and Password, then click on the down arrow below these fields and select the Data set you want to access.